Ag and Cr oxide nanodots sputter decorated over Mn-Co-Cu ternary metal oxide nanostructures for high-performance supercapacitor. (15th August 2023)

• Record Type: Journal Article
• Authors: Raghav, Jyoti; Deepak, Deepak; Roy, Susanta Sinha; Roy, Soumyendu
• Is Part Of: Journal of energy storage. Volume 65(2023)
• Publication Date: 2023-08-15
• Subjects: Transition metal oxides -- Energy density -- Faradaic reactions -- Pseudocapacitor -- Hybrid nanostructures -- DC sputtering; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2023.107288
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Hybrid nanostructures of quaternary composite of transition metal oxides (QCTMO) are fabricated by sputter depositing nano-dots of silver oxide or chromium oxide over flower-like nanostructures of manganese-cobalt-copper (MCC) ternary metal oxide. QCTMO electrodes are fabricated by magnetron assisted DC sputtering using different plasma powers. The presence of four different multivalent metal ions increases the redox sites, while the hybrid nature of the nanostructures increases the electrochemically active surface area. The synergistic effects result in enhancing the performance of the electrode. We showed that plasma power can be used to control the morphology and electrochemical properties of QCTMO electrodes. Chromium oxide nano-dots sputter deposited over MCC at 65 W showed the best performance with specific capacitance of 2261 F g −1 at a scan rate of 1 mV s −1 and specific capacity of 603 C g −1 at 5 mA cm −2 . Solid-state symmetric supercapacitor fabricated with this electrode shows a retention in capacitance of 93 % after 4000 charge-discharge cycles and high energy density of 106 W h kg −1 at 3236.3 W kg −1 of power density. Highlights: Fabrication of quaternary composite of transition metal oxides via hydrothermal method followed by sputtering. Change in morphology was observed with change in plasma power. Specific capacitance of 2261 F g −1 at a scan rate of 1 mV s −1 was demonstrated by best performing electrode. Symmetric device, fabricated using best performing electrodes, demonstrated energy density of 106 W h kg −1 . Fabricated quaternary composite displayed better result in comparison to ternary metal oxide.